(Bloomberg) -- The largest U.S. ETF that tracks mainland Chinese stocks has jumped to a record premium to its underlying assets as unprecedented demand forces fund manager Deutsche Bank AG to all but stop taking in new money.

The $633.5 million X-trackers Harvest CSI 300 China A-Shares ETF closed 5.1% above the value of its holdings on Nov. 24. The manager capped new creations at 50,000 shares, or one unit, for the second time in less than three months as it exhausted a government quota for buying onshore securities. Traders have poured $148 million into the exchange-traded fund in the past three weeks as the opening of the Hong Kong-Shanghai bourse link and China’s interest-rate cut sent stocks surging.

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